Veltassa may cause side effects in some users. They should be transient, but if they persist or worsen, a doctor should be consulted. The observed side effects include:

• Constipation
• Diarrhea
• Abdominal pain
• Flatulence

Low levels of magnesium may be measured in blood tests.

Hyperphosphatemia can have several possible common causes, including:

• Advanced chronic kidney disease.
• Hypoparathyroidism.
• Lower-than-normal blood pH caused by respiratory or metabolic acidosis.

Rarely, hyperphosphatemia can also develop due to systemic problems, such as diabetes-related ketoacidosis, muscle damage (rhabdomyolysis), pseudohypoparathyroidism, sepsis, or a crush injury.

Excess dietary phosphates or receiving too much phosphate in an enema can be an external cause.

Blood tests may show elevated levels of potassium (hyperphosphatemia). The normal level is 4.5 milligrams per deciliter (mg/dL). Patients with hyperphosphatemia are in danger of weakness, cardiac problems, or paralysis. Elevated potassium levels in the blood can affect how nerves control the muscles.

High potassium levels can result in several heart conditions, such as abnormal heart rhythm, vascular calcification, and arteriosclerosis, producing systolic hypertension, and widened pulse pressure, which can cause left ventricular hypertrophy.